Coal drill



June 3 1924. 1,496,153

E. J. DooLEY COAL DRILL Filed May 17, 1922 Patented ,lune 3, 1924.

NTED STATES PATENT FFICE.

EDWARD 3. DOOLEY,

or rnonrn, ILLINOIS, assIGNoIiL 'ro iJOoLiivv BROS., or rnOnIA, ILLINOIS, A CORPORATION or ILLINOIS.

COAL DRILL.

Application To all whom t may concern:

` Be it known that I, EDWARD J. DOOLEY, a citizen of the United States, and a resident of Peoria, in the county of Peoria and State of Illinois, have invented certain new and useful Improvements in Goal Drills, of which the following is a full, clear, an exact description, reference being had to the accompanying rawing, forming part of this specification. K y Y My invention relatesy primarily to oneman portable drilling outfits, preferably power operated, for use in coal and other mining operations.

' One object of my invention is the elimination of the troublesheretofore experience with machines of this nature by reason of the split nut for the thread bar. p

Another object of my invention is to properly support the over-hung portion o the thread bar.

Another object of my invention is to make the thread bar reversible and provided with a driving gear which is also reversible in its position on the thread bar to the end that when the thread bar has been advanced to the limit of its travel, its position may be reversed andthe parts be reassembled in starting position. f.

Another object of my invention is to provide a drill with asuitable motor for the operation of the thread bar and also to proj vide suitable angular adjustments whereby the device may be set to drill ahole at any angle within the range usually employed in this class of work. I n

Otherobjects of my invention will apear and be described in the specification.

' The novelty of my invention will be hereinafter more fully set forth and specifically pointed out in the claims.

In the accompanying drawing:

Fig. 1, is a perspective view of a device embodying my invention. y

Fig. 2, is an enlarged central sectional side elevation of the feeding and' driving mechanism. y

Fig. 3,'is an Fig. 4, is a nut. Y Y

The same numerals of reference are used to indicate identical ,parts in all figures.

In its preferred formY of construction my drill .is mountedl on the usual postv 1, by

means of the usual chair or saddle 2, the

end view of Fig. 2. side view of the thread bar filed May 17, 1922. Serial No. 561,573.

d rill proper `comprising a split boxing consisting of the lower. section 3 and cap 4 between which and the lower section 3, the4 nut 5, is positioned, the thread bar 6 passing through the nut and carrying the'drill bit 7. The thread bar 6 is splined as at 8 Figs. 2 and 3, and the driving gear 9 carries a key to engage the'spline to rotate the thread bar. vA pinion 10 is mounted on a stud 11 carried by the lower section 8 of the box, and is connected by a coupling 12 to an electric or other suitable motor 13, the

latter being carried by a pair of brackets 14 which are secured to` lugs 15 depending from the main section 3 of the boX.

The main section 3 of the box carries a pair of trunnions 16 which engage hooks 17 of the slide or saddle 2 and permit the drill to be swung to any angular position with relation to the pos A quadrant 18 is carried by the brackets 14 and engages a cross bar 19 carried by the slide or saddle 2 through the medium of the arms 2O which lie in the channels forming 'the post 1, these arts being arranged so that, by means o the handle 21,- the quadrant 18 may be raised and the drill tilted to the desired position and held in that position by the en gagement of the quadrant 18 with the cross bar 19. Motors such as shown in the drawing are usually provided with handles one ofwhich 22 is preferably left on themotor when it is mounted on the drill and serves es zlhandle for adjusting the position of the ri f A guide roller 23 is mounted by means of bars 24: and 25 to support the thread bar when the latter is in starting position and until it has traveled through the nut 5 to a point where sufficient of its length has passed through the nut to partly' counterbalance the overhang, this guide roller supporting the thread bar to reduce thefwear on the nut 5 whichwould occur if this nut had to carry the overhung weight of the thread bar.

It will be noted by referring to Figs. 2 and L1, that the nut 5 is provided with a flange 26 at each end and a lug 27 at the center of its length. The fianges 26' are equal in size and form the abutment for the nut when in position in the b' The bore of the box between the recesses for vthe flanges 26 is larger than the' barrel of nut between the flanges, the only contact lthe nut and The lower section 3 of the box carries a` end; that frictionof the parts in operation maybe reducedy to the minimum.` The pinion 10y is also provided with a thrust bearing 31.

The thread bar 6 is squared or otherwise suitably shaped at each end so that the socketof the drill bit 7 may be interchangeably mounted on each end of the thread bar.

As shown more clearly in Fig. 3, the upper section` 4 or the box is pivotally con.- nected` as at 32 with` the 'main section 3, at One side of the box and is held in'closed position by a key 33 which is carriedbetween a pair of upstanding lugs 34 of the lower section 3l of the box the shape of this keybeing better shown in Fig, l.

e` operation of the devicegis as follows.

Assuming that the shown; in Fig. l. and that the postI is properly mounted between the Hoor and roof of a mine, the operator'adjust's the angle at which he desires to drill the holeby means of quadrant ing the bit 'forward until the bit has penetratedf thel length of the thread bar, wherethe motor is stopped and; the key 33 moved to release the upper section of the box, whereupon the upper section of the box is turned upon its pivot and the thread bar, gear, and nut are raised and retractedk to bring the drill bit out of the hole, whereupon the gear 9 is removed from the thread i upon theothersend therei the nut,` the thread bar is reversed, and a longer drill bit attached to the end opposite to that which formerly carried the drill bit,y and the point of the drill bit inserted in the hole to bring gear into proper position and reen-gagement with the box, the thread bar then resting on the guide roller 23 `whereupon the upper portion 4 of the box is Closed over the nut and looked by the keyl 33. The motor is againl started to rotate and advance the drill bit another thread bar length.

If it is desired to continue thel drilling, the upper section of the box may be again turned back on its pivot and the gear, thread bar,'and nut again raised out of ment andV reversed, and a section inserted between kthe drill bit and thev thread bar Ato obtain the full and the parts :re-assembled for drilling the hole t a further depth and so on.

By making the nut solid, I am enabled benelit of its threads whereas, in previous constructions where the thread bar nut has been split, one halt` being Carried on the lower portion of the box and the other half being Carried on the upper portion practically all of the wear has come on the threads of the lower half because of the play between the upper and lower hal-ves of the box, these parts `being usually fitted together without proper machine work and no provision being made wear is equally distributed to both sides of the threads in the nut and on the thread bar.

By supporting the over hungy portion of the thread bar, its weight is rendered ineffective to cause undue binding and wear on the nut.

By providing the quadrant for thel angular position of the drill, ment of the hole jectingthe parts to kundue strain.

aving thus fully described my invention, I claim.

l. In a coal drill the combination of7 a post, a chair mounted on the post and'provided with means whereby it may be adjusted to diierent positions along the post, a box carried by the chair in swingable relation thereto, drilling mechanism and gearing carried by the box, amotor for driving the drilling mechanism, the motor being mounted in xed relation to the box, and angle adjusting means cooperating bemounting for chair whereby the angular position of the box and the associated parts may be adjusted. v

2. In a coal drill the combination.,y of a post, a chair provided lwith a tion, a box swingably mounted the alignby the box, a motor for the drill v nism, a mounting for the motor carried by the box, andangle adjusting means cooperating between themounting for and the depending portion of the V 3. In a drill thev combination of a post, a sliding chair mounted thereon and adjustable with relation thereto and comprising in part a depending portion, a box swingably mounted on the chair` drilling ymechanism and its gearing carried by the box, a frame attached to the box, a motor carried bythe frame for driving the drilling mechanism, a. thread bar guide and an angle adjustingmember carried by the frame and cooperating with the dependingfportion of the chair. EDWARD J. DOOLEY...

oha ir.

adjusting is maintained without subthe motor and the carried by the frame, 25 

